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Re: Curved Stair

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Forget using a channel. Torsion will kill you on a curved stair. You may want to
consider a steel tube section for starters.
I would recommend looking at the text book "Basic Structural Analysis" by
Gerstle, section 3.4 "Curved Structures in Space."
Another design guide would be the old stand by "Design of Welded Structures" by
Blodgett.

Good luck.

Nick.